Methods and apparatus are provided for providing UE EPS capability information and receiving non-access stratum (NAS) security algorithm information for an interworking procedure in the 5GS network. In one novel aspect, the UE provides the UE EPS capability information in cleartext before the security mode procedure, and the NAS security algorithm information is included in a security mode command message during the security mode procedure. In one embodiment, the UE EPS capability information is an S1 mode indicator or the 5GMM capability information including the Si mode indicator. In another novel aspect, the network provides the NAS security algorithm information before interworking procedure from 5GS to LTE. In one embodiment, the network provides the NAS security algorithm information in the Registration Accept message. In another embodiment, the network provides the NAS security algorithm information in handover procedure from the 5GS to LTE.
Legal claims defining the scope of protection, as filed with the USPTO.
2. The method of claim 1, wherein the received NAS security algorithm information is included in a security mode command message.
3. The method of claim 1, wherein the UE EPS capability information indicates whether the UE supports an S1 mode interface.
4. The method of claim 3, wherein the UE EPS capability information includes an S1 mode indicator.
5. The method of claim 4, further comprising: sending a Security Mode Complete message including 5G mobility management (5GMM) capability information in the security mode procedure to the wireless network.
6. The method of claim 5, wherein the 5GMM capability information does not include the S1 mode indicator.
7. The method of claim 4, wherein the UE EPS capability information is 5GMM capability information including the S1 mode indicator.
8. The method of claim 7, further comprising: sending a Security Mode Complete message not including 5GMM capability information in the security mode procedure to the wireless network.
9. The method of claim 1, further comprising: performing the interworking procedure from the 5GS to the EPS based on the received NAS security algorithm information.
11. The method of claim 10, wherein the received NAS security algorithm information is included in a security mode command message.
12. The method of claim 10, wherein the UE EPS capability information indicates whether the UE supports an S1 mode interface.
13. The method of claim 12, wherein the UE EPS capability information includes an S1 mode indicator.
14. The method of claim 13, further comprising: receiving a Security Mode Complete message including 5G mobility management (5GMM) capability information in the security mode procedure from the UE.
15. The method of claim 14, wherein the 5GMM capability information does not include the S1 mode indicator.
16. The method of claim 13, wherein the UE EPS capability information is 5GMM capability information including the S1 mode indicator.
17. The method of claim 16, further comprising: receiving a Security Mode Complete message not including 5GMM capability information in the security mode procedure from the UE.
18. The method of claim 10, further comprising: performing the interworking procedure from the 5GS to the EPS based on the received NAS security algorithm information.
20. The method of claim 19, wherein the NAS security algorithm information is included in a Registration Accept message or a handover command.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
August 7, 2020
January 31, 2023
Browse 5M+ US patents with plain-English claim translations and AI-generated analysis.